If you're looking for manga similar to Grand Sun, you might like these titles.
After the death of her parents, Tsukasa turns to her classmate Ryuji, a yakuza boss, for shelter and a job. Ryuji is generally grave, but purposefully indebts Tsukasa to him so that she has to keep working for him, and he can keep his friend near him. Tsukasa is a simple-minded girl who desperately searches for money to pay off her debts to Ryuji. To make money, she takes on suspicious jobs in addition to being Ryuji's bodyguard, but always ends up in trouble. Ryuji and Tsukasa take turns saving each other as they fight together against the spread of dangerous drugs and weaponry that would destroy Tokyo even more than it has already degraded.
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Both have Bodugaurds from a rough back grounds / past. T.C.P. Girl brought up iin cop family. G.S. girl brought up in a mercenary type family.
Strong femal roles in both with strong quiet type male counter part.
Mahiru goes in search of her sister who has been missing for 2 years now and meets Yukito claiming to be a bodyguard and her proxy. He warns her that her sister is probably involved in something dangerous, but she can't give up. This choice forever changes her.
Mahiro thought she was all alone in the world until her long-lost brother, Ren, and his handsome, mysterious friend showed up and turned everything upside down! Competent, determined and dangerous, the two men have vowed to protect the innocent girl from the ruthless Queen Phibula, who is hell-bent on seeing her dead. As Mahiro learns more about her forgotten past, she and her handsome bodyguards must face explosions, assassins, betrayal... and the promise of blossoming romance.
Matsumiya Kana lost everything when her father was arrested and charged with embezzling funds from the Japanese Ministry of Defense. However, she soon learns that her father actually worked for a secret organization within the Department of Internal Affairs, and was in charge of embezzling money to support it off the books. He was being used by an "embezzlement group" within the secret organization, and that group is willing to kill to keep their activities quiet. The life of his daughter, Kana, is the perfect blackmail to ensure his silence. Within a corrupt agency, where anyone could be a traitor, will Kana be able to avoid falling into the hands of those plotting against her...?
The cute new heiress of the Jo-Sun throne, Jung Gyuh-Woon! She ends up having two handsome bodyguards by her side! Through all her happiness from being escorted by the knights as the queen, the danger surrounding her slowly creeps closer. Knights, you have to protect the Queen!
The designer Bambi lives together with his three bodyguards Yume, Shuu and Kotaro. However, there’s something unusual about these three bodyguards…
Memori Fujieda is not only a university student, he's also the pretty face of his brother's bodyguard company, taking on important cases with ease. But when the mysterious Yuuki Shin comes along, wishing to join the company, Memori finds himself with an unlikely partner – a partner with a dangerous, deadly secret...
When he takes off his gloves, when his hands are about to touch me, my heart starts to race... Rivener is the bodyguard of the count, he regularly pats her head. "He treats me like a kid." Is that the truth or is there something more?